Furnace structure.



H. L. MEYER.

FURNACE STRUCTURE.

APPLICATION FILED rzB.21.1913.

1,1 21,569, Patented Dec. 15,1914.

2 SHEETS-SHEET 1.

H. L. MEYER.

FURNACE STRUCTURE.

APPLICATION FILED 1112.21, 1913.

1,121,569. Patented Dec. 15,1914.

2 $HEBTS-SHEET 2.

I ,Zjy. 5f

llHD STATES PATENT union.

HERMAN L. MEYER, on ST. PAUL, MINNESOTA.

FURNACE STRUCTURE,-

Specification of Letters Z Patent.

Patented Dec. 15,1914.

Application filed February 21, 1913. Serial No. 749,797.

To all whom it may concern Be it known that l, HERMAN L. MEYER, a citizen of the United States, residing at St. Paul, inthe county of Ramsey andSt-ate of Minnesota, have invented anew and useful Improvement in Furnace Stru ctures, of which thefollowing 1s a specification. The ob ect'of this invention s to provide a furnace structure for'boilers, bake ovens waste heat is utilized to heat air to the ignit mg point which in turn is introduced where it will burn the free carbon released by the fire.

In the accompanying drawings forming part of this specification, Figure 1 is a lon-j gitudinal vertical section of the furnace structure of a boilersetting, embodying my invention; Fig. 2 is plan of Fig. 1; Fig.'-3 is a. vertical section taken upon the line Y-Y.of Fi g. 1;-Fig. lis a perspective ,view partly in section of a detail illustrating the damper-by which thelport openings in-the bridge wall may be closed or regulated, and Fig. 5 is a'plan view of adetail illustrating an itltGlIliltlVG construction for admitting air into the furnace structure Referring to the drawings 2 and 3 indiev cate the front and back walls and 4 and 5 the side walls of a furnace structure forming a setting for the horizontal boiler A. 6 indicates the fire door, 7 the grate supported between the side walls and the front wall and bridge wall B, 8 the clean out door inthe back wall 3, and 9 the "smoke outlet from the smoke drum 10 in the front end of the boiler, all of these parts being arranged in a suitable manner as is customary in' the art of furnace structures for steam boilers.

The bridge wall is suitablyv positioned across the space below the boiler and between the sides of the furnace structure and with the side walls and front wall 2 forms the usual ash pit 11 below the grate. At the back of the bridge wall there is a floor or wall C sloping back to the rear end of the furnace structure which with the bridge wall and foundation produce a preheating air chamber D,,and a'reverberatory chamber E communicating with the fire space F above the grate, by a passage G formed by the lower surface of the shell ,ofthe boiler and the top of the bridge wall. By this construction draft issuing from the fire on the grate passesover the bridge wall in contact with the lower surface of the boiler shell into the reverberatory chamber E and from the reverberatory chamber it passes up over the rear end of the'boiler and continues horizontally through the boiler, up through the smoke drum and out through the outlet 9. v 1

Inorder to preheat the air which is used for draft purposes upon the fuel on the. grate, the bridge wall is formed witha plurality of air ducts 12, and the side walls 4 and 5 are provided with air inlet passages 18 and 14, leading from the front of the furnace structure and passing into the preheating chamber D through the ports 15,. .The

walls 4-. andwawarm the air which is ad mitted to the fuel on the 'grate, the chamber D increasing its temperature and thus aiding combustion, it being well known that hot air fed on afii 'eproduces more complete" combustion than cold air. The air. ducts 12 maybe closed ormodified in size for reg'ilating the draft by a damper.16,'which is adjusted by a draw bar 19 extending through the wall4 and a handle 20 connected to :said draw bar whereby it can be reciprocated.

It is well known that if air heated t proper temperature is caused to commingle with'gases and products of combustion issuing from a fire before they are reduced in temperature, that the tendency is to produce complete combustion, greater economy and reducethe amount of smoke to a minimum. To accomplish this result I have found in practice by exposing the air to the action of heat above or adjacent the bridge wall and admitting the air so heated into the reverberatory chamber whereit is caused to-com-' mingle while in extremely heated condition with the gases andproducts of combustion from the fire, substantially all of said prodnets of combustion are consumed and converted into heat. The construction by which this result is produced may be in the form of a pipe or tube H, placed on the upper surtemperature) by the tube and the parts with which the tube connects is admitted into the reverberatory chamber where it commingles and readily unites with the gases and products of combustion. The amount of air which is admitted through the superheating tube H into the reverberatory chamber may be regulated by the dampers 26, on the front wall 'of the furnace structure'over the ends of the passages 13 and 14. By this means the air is superheated progressively, first by the walls'of thefurnace structure, next by the reverberatory chamber, next' by the bridge wall and finally by the superheating tube H, the result being that the air is heated to a high degree of temperature and into condition whereby it produces the most economical-and best results when it commingles with the gases and products of combustion in the reverberatory chamber. The fact that the reverberatory chamber increases in size from the bridge wall back tothe rear of the boiler causes the gases and products of combustion' to expand and thoroughly commingle thus mixing the highly heated air from'the superheater tube with the gases and products of combustion. The superheater tube may be made of copper or other suitable material'or its, surface may be partly or wholly protected by fire clay or other suitable, non fusible material. Its position or .the position of its orifices 25 may also be changed so long as the superheated air is ad' 'mitted to commingle with the hot gases and products of combustion while they are in a highly heated state and not directly over the fire. The space bounded by the top of the bridge wall, the lower surface of the boiler and the side walls 2 of the furnace structure is closed by-walls 30 which co-act with the 'top of the bridge wall in producing a narrow horizontal space or throatthrough result being that the bridge wall, superheating tubeand air therein are heated to Copies of this patent may be-obtained for claim.

v of two subscribing witnesses. I which the draft from the fire passes and in which the superheatingtube is placed, the

five cents each, by ad'dressiiig'the Washington. D. C. 1

a high degree of temperature. It is-not necessary that the airbe admitted into the reverberatory chamber by passing it'longitudinally from the front of the furnace to the rear end of said chamber asv described. It

being v obvious that, it may be admitted through passages 27 in the side walls, (see regulated such as by a damper 28.

In'accordan'ce with the patent statutes 1 have described theprinciples of operation of my invention together'with the appara-j tus which I now consider to represent the best embodiment thereof but I desire to have it understood that the construction shown is only illustrative and that the-invention can be carried out by other means anduapplied to uses other than those above set forth within the scope I of the following Having described my invention, what .I

claim asnew and desire to protect by Let- 1 ters Patent is In a furnace structure, a boiler, outside,

walls forming a fire space below said boiler,

front of said bridge wall, 'apre9heating air a bridge wall across said space, a grate in chamber back of said bridgefw'all and form'- ing the lower sideof a reverberatory cham;

her for gases and products of combustion issuing from burning fuel on'said grate,

said outside walls having longitudinal, pas sages for air nto said pie-heating chamber,

and said bridge wall having an air super-- heating passage extending longitudinally.

thereof and formed with entryports from said pro-heating chamber, and a single air superheating pipe placed'longitudinally of and above said bridgewallfacross the direct action of draft issuing from the fire having a free direct passage for air therein, being bent downwardly at-both ends and its :ends

seated in said bridge wall and connected with the superheating passage therein, said pipe being formed with'openings'inits rearward side abovethe bridge wall adapted to expel superheated air from within into said reverberatory chamber where it may commin le with the volatile gases and burn] the freecarbonfrom the fire.

In testimony whereof, I have signed my name to this specification, in the presence H. L. FISCHER, F. G. B iADBURr.

. Commissioner of Patents, 

